# A013391 (b-file synthesized from sequence entry)
0 0
1 3
2 23
3 721
4 25199
5 1716121
6 141920855
7 20103619537
8 4016386229855
9 1241116799607721
10 494609567396520071
11 244232906612554953633
12 140315440295583485315151
13 92810530303082004433849401